Hi @AlisonPascoe welcome to the community and thanks for posting. I'm really sorry to see you're having problems viewing your freeview channels after retuning your Youview box.
I've found some info on the freeview website related to recent changes on the Beacon Hill transmitter which is close to Yeovil. The changes don't mention the channels you're having difficulty with but I'd recommend you report it to freeview on the link I've posted as they may be able to offer you some advice on how to resolve this.
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